Bra Size

About Bra Size

Bra Size is a free reference site for shoppers who want to make sense of bra sizing. It turns underbust and bust measurements into a starting size with US, UK, EU and AU labels, and explains how band numbers and cup letters relate to each other.

Beyond the main calculator, the site offers focused tools for sister sizes, brand size comparisons, a fit checker, sports, strapless, maternity and nursing, plus-size, men's and first bras. It also covers panty, swimwear, shapewear and matching-set sizing. A library of guides covers how to measure at home, cup size sequences, measurement charts and signs a bra does not fit.

The site presents results as starting points rather than guarantees, noting that brand charts and garment design affect fit. It states that measurements stay in the browser, and a button lets users clear their saved data.